No negative news. That is what Guangdong authorities have told local media they want to see ahead of politically sensitive anniversaries in a bid to silence dissent, which they fear could bring an atmosphere of social instability.

The Communist Party's propaganda department has set up a points-based penalty system for the print media in a stepped-up effort to tighten its grip on the sector ahead of a crucial party congress this autumn, according to sources.

Media outlets will be allocated 12 points each and subject to closure if all their points are deducted.